Multiple Choice
In a molecule with a trigonal pyramidal shape, how many outer atoms and lone pairs are present around the central atom?
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12. Molecular Shapes & Valence Bond Theory
Molecular Geometry
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Which type of electron-pair geometry does CO_2 exhibit?
A
Bent
B
Linear
C
Trigonal planar
D
Tetrahedral
Verified step by step guidance1
Identify the central atom in the molecule CO_2, which is carbon (C).
Determine the number of electron groups around the central atom. In CO_2, carbon forms two double bonds with oxygen atoms, so there are two regions of electron density.
Use the VSEPR (Valence Shell Electron Pair Repulsion) theory to predict the electron-pair geometry. Two regions of electron density around the central atom will arrange themselves to be as far apart as possible.
Recall that two electron groups around a central atom result in a linear electron-pair geometry with a bond angle of approximately 180 degrees.
Conclude that the electron-pair geometry of CO_2 is linear, not bent, trigonal planar, or tetrahedral.
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